Jmol Applet Deployment Local
This page will summarize discussions on the jmol-user mailing list on how Jmol should be installed to work from a local hard disk or CD, instead of from a web server.
Contents
Rules for first-time user developing Jmol pages that will run from local disk:
Method (a)
Use pages only from a web server. For testing purposes, you may wish to install a local web server on your computer.
Method (b)
This works both locally and on the web server; depends on Java security rules, which might change in a future.
Update: recent versions of Java and browsers (particularly Firefox) apply a more restrictive policy, affecting also the location of html files -- A better description is planned; for now, see the graphic examples below.
Molecule files (e.g. .pdb, .mol) must be in the same folder as the applet files or below it (in a subfolder).
Valid examples (see also graphic examples below):
1.- Put 
Jmol.js and the set of JmolApplet0*.jar files on the top folder level of your website; then, for a page in a subfolder:
<html>
<head>
<script type="text/javascript" src="../Jmol.js"></script>
</head>
<body>
<script type="text/javascript">
jmolInitialize("../");
jmolApplet(200, "load caffeine.xyz");
</script>
</body>
</html>
2.- Same for a page in a subfolder two levels below:
<html>
<head>
<script type="text/javascript" src="../../Jmol.js"></script>
</head>
<body>
<script type="text/javascript">
jmolInitialize("../../");
jmolApplet(200, "load caffeine.xyz");
</script>
</body>
</html>
3.- Same as (1) but the model file is in a subfolder (named e.g. 'models') below the page itself:
<html>
<head>
<script type="text/javascript" src="../Jmol.js"></script>
</head>
<body>
<script type="text/javascript">
jmolInitialize("../");
jmolApplet(200, "load models/caffeine.xyz");
</script>
</body>
</html>
Method (c)
This works both locally and on the web server.
Use the "signed applet" files, JmolAppletSigned0*.jar,
also included in the Jmol distribution download page
You can put applet files, model files and page files wherever you want to.
The users will receive a security warning from Java asking whether they accept the use of the signed applet (this may deter novice users from entering your pages, unless you first give them precise advice that this will show up and it is not harmful).
Examples of folder arrangement
This applies to running Jmol unsigned applet (JmolApplet0*.jar files) in local disks successfully (i.e. without Java security errors).
Recent (June 2010) Java and browser security policies are considered in these examples.
If pages are run from a web server, any folder arrangement should work; these examples and explanations only apply to local disk.
- Note: there are now reports that even from a web server some folder setups may raise Java security errors too. If so, please try UseCommandThread and share your findings in the email list.
Jmol parent, models same
These layouts give no problems.
| P |  |
JmolApplet jar files | ||
|---|---|---|---|---|
| X |  |
|
html files, model and script files | |
| C |  |
 |
|
|
| S | |
|
| P | |
JmolApplet jar files | ||
|---|---|---|---|---|
| X | |
|
||
| C | |
|
|
html files, model and script files |
| S | |
|
Jmol parent, models child
This layout gives no problems.
| P | |
JmolApplet jar files | ||
|---|---|---|---|---|
| X | |
|
html files | |
| C | |
|
|
model and script files |
| S | |
|
Jmol sibling, models same
This layout cannot be used from local disk.
| P | |
|||
|---|---|---|---|---|
| X | |
|
html files, model and script files | |
| C | |
|
|
|
| S | |
|
JmolApplet jar files |
Jmol sibling, models sibling
This layout may be used from local disk, only
if you add UseCommandThread=true to your page (see details below). This may also apply to pages run from a server.
| P | |
|||
|---|---|---|---|---|
| X | |
|
html files | |
| C | |
|
|
|
| S | |
|
JmolApplet jar files, model and script files |
Additional methods
Conditional use of the signed applet
In order to have the applet used be signed or not signed depending on whether you are serving the pages from a server or testing them locally, one can use the following construct for the initialization:
jmolInitialize("../../Jmol", window.location.protocol=="file:");
// use the signed applet if needed
Activating UseCommandThread
This Jmol parameter defines whether some commands coming from the page UI controls (like a jmolButton) use or not a different thread. As a consequence, the Jmol script commands coming from the UI controls may be denied access to files by Java security policy.
Setting this on (or true) avoids some Java security locks, such as loading a file from a folder different to the one the html page is in (but the rule 'model files together or below the Jmol files' must still be satisfied). Use it like this:
jmolSetCallback("UseCommandThread","true")
or like this:
jmolSetParameter("useCommandThread","true")
Both must go after jmolInitialize() and before jmolApplet().
Comments
From Bob Hanson:
I believe the rule is simply this:
On a hard drive, all files opened by the applet (model or otherwise)
must be in the same directory or a subdirectory of the .jar file.
The only problem comes if you place the .jar file in some other subdirectory
not somewhere on the "path" to the model file. Then the page might work if
uploaded to a server, but won't work on your local machine in file:/// mode.
Nick Greeves provides this screen shot of his directory structure, where
you can see how he has caffeine.xyz.gz in the model subdirectory of the jmol directory,
where JmolApplet.jar is found.
HTML, JS, IMG files -- all these can be anywhere, including on totally different servers.
So, if this is important to you, place the .jar file in the TOP subdirectory
of your project, and there will be no problem. (I am not recommending placing the .jar file in c:\)
From Nick Greeves:
For the record here's the source of WorksFromaCD.html that shows the paths.
<html>
<head>
<title>Simple example</title>
<script src="Jmol.js"></script>
</head>
<body>
<script>
jmolInitialize("../jmol");
jmolApplet(200, "load model/caffeine.xyz.gz");
</script>
</body>
</html>
From Angel Herráez: Nick, I think although your example is correct, it will mislead people. There is no need for a jmol folder. Your code should be
jmolInitialize("./");
since the applet is in the same directory/folder as the html page. Even "" might work the same as "./"
